lemon balm

Lemon balm contains rosmarinic acid, caffeic acid, flavonoids, and essential oil compounds including citronellal, geranial, and neral that give it its citrus aroma. Rosmarinic acid has antioxidant and anti-inflammatory properties, and laboratory studies suggest interactions with GABA pathways that may underlie traditional use for relaxation and sleep. Research has explored possible effects on cognitive function and mood, with some studies showing acute improvements in calmness, alertness, or memory after single doses or short-term use. Mechanisms may include modulation of acetylcholine receptors and effects on GABA transaminase, the enzyme that breaks down GABA. Topical applications have shown antiviral activity against herpes simplex virus. Lemon balm's mild safety profile and pleasant taste make it a common ingredient in herbal teas and supplements targeting stress, sleep, and digestion. Effects are typically modest, and lemon balm is more often used as part of combination products than as a standalone intervention.

There is no established RDA. Traditional dried leaf preparations use 1.5 to 4.5 grams per day as a tea or infusion. Standardized extracts (often standardized to rosmarinic acid content) are commonly dosed at 300 to 600 mg per day. Some clinical trials have used Cyracos brand extract at 600 mg per day for stress and sleep applications.

Lemon balm is typically taken in the evening for sleep and stress applications, or two to three times daily for ongoing stress support. It can be taken with or without food. Effects on stress and mood often emerge within hours of single doses. Tea preparations are commonly used acutely for relaxation. For ongoing use, consistency over days to weeks is typical.

Lemon balm is generally very well tolerated. Side effects are uncommon and may include mild nausea, drowsiness, and dizziness, particularly at higher doses. There is no established Tolerable Upper Intake Level. Topical use occasionally causes skin irritation. Long-term safety appears favorable, though most studies have been short-term.

Lemon balm may potentiate CNS depressants including alcohol, benzodiazepines, and sleep medications. May affect thyroid medication absorption and possibly modulate thyroid function at high doses. Possible interactions with HIV medications and other CYP enzyme substrates have been suggested but not well documented. Generally considered low-interaction at typical doses.